Other World Computing offers a selection of used Apple MacBook Air Laptops, with prices starting at $519. Plus, all orders qualify for free shipping. Each item is covered by a 90-day OWC warranty. (Some items may carry additional AppleCare coverage.) Note that for some models, available quantities may be limited.

The Apple Store discounts a selection of its factory-refurbished MacBook Air Laptops, with prices starting at $769. Plus, all orders qualify for free shipping. Each system carries a 1-year Apple warranty (the same as new units). Some best bets, compared to the best prices we could find for new units elsewhere:

Yugster offers the refurbished 2.38-lb. MacBook Air Intel Core i5 1.7GHz 13.3" Laptop, model no. MC966LL/A, for $789.97. Coupon code "DEALNEWSDEAL" cuts it to $779.97. With free shipping, that's $69 under our mention of a used unit from last spring and the lowest total price we've seen for this model. (It's also a current low for a refurb by $148.) It features an Intel Core i5 1.7GHz processor, 13.3" 1440x900 TFT glossy LCD, 4GB RAM, 256GB SSD, webcam, USB, Mac OS X 10.9 (Mavericks).

A 90-day Yugster warranty applies. Of note, the countdown timer on the product page does not reflect an actual expiration time and resets daily.